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Finding the Fourth Proportional to 443.78, 612.37 and 257.33

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Solution

The fourth proportional to 443.78, 612.37 and 257.33 is: 355.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.78 : 612.37 = 257.33 : x
  2. Step 2: Convert to fraction form
    443.78/612.37 = 257.33/x
  3. Step 3: Cross multiply
    443.78x = 612.37 × 257.33
  4. Step 4: Simplify right side
    443.78x = 157,576.82
  5. Step 5: Solve for x
    x = 157,576.82/443.78
  6. Step 6: Final answer
    x = 355.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.